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.Dd January 29, 2009
.Dt AUDITON 2
.Os
.Sh NAME
.Nm auditon
.Nd "configure system audit parameters"
.Sh SYNOPSIS
.In bsm/audit.h
.Ft int
.Fn auditon "int cmd" "void *data" "u_int length"
.Sh DESCRIPTION
The
.Fn auditon
system call is used to manipulate various audit control operations.
The
.Fa data
argument
should point to a structure whose type depends on the command.
The
.Fa length
argument
specifies the size of
.Fa *data
in bytes.
The
.Fa cmd
argument
may be any of the following:
.Bl -tag -width ".It Dv A_GETPINFO_ADDR"
.It Dv A_SETPOLICY
Set audit policy flags.
The
.Fa data
argument
must point to a
.Vt int
value set to one or more the following audit
policy control values bitwise OR'ed together:
.Dv AUDIT_CNT ,
.Dv AUDIT_AHLT ,
.Dv AUDIT_ARGV ,
and
.Dv AUDIT_ARGE .
If
.Dv AUDIT_CNT is set, the system will continue even if it becomes low
on space and discontinue logging events until the low space condition is 
remedied.
If it is not set, audited events will block until the low space 
condition is remedied.
Unaudited events, however, are unaffected.
If 
.Dv AUDIT_AHLT is set, a 
.Xr panic 9
if it cannot write an event to the global audit log file.
If 
.Dv AUDIT_ARGV
is set, then the argument list passed to the 
.Xr execve 2 
system call will be audited.  If
.Dv AUDIT_ARGE
is set, then the environment variables passed to the
.Xr execve 2
system call will be audited.  The default policy is none of the audit policy
control flags set. 
.It Dv A_SETKAUDIT
Set the host information.
The
.Fa data
argument
must point to a
.Vt auditinfo_addr_t
structure containing the host IP address information.
After setting, audit records
that are created as a result of kernel events will contain
this information. 
.It Dv A_SETKMASK
Set the kernel preselection masks (success and failure).
The
.Fa data
argument
must point to a
.Vt au_mask_t
structure containing the mask values as defined in 
.In bsm/audit.h .
These masks are used for non-attributable audit event preselection. 
The field
.Fa am_success
specifies which classes of successful audit events are to be logged to the
audit trail. The field
.Fa am_failure
specifies which classes of failed audit events are to be logged. The value of
both fields is the bitwise OR'ing of the audit event classes specified in
.Fa bsm/audit.h .
The various audit classes are described more fully in
.Xr audit_class 5 .
.It Dv A_SETQCTRL
Set kernel audit queue parameters.
The
.Fa data
argument
must point to a
.Vt au_qctrl_t
structure (defined in
.In bsm/audit.h )
containing the kernel audit queue control settings:
.Fa aq_hiwater ,
.Fa aq_lowater ,
.Fa aq_bufsz ,
.Fa aq_delay ,
and
.Fa aq_minfree .
The field
.Fa aq_hiwater
defines the maximum number of audit record entries in the queue used to store
the audit records ready for delivery to disk.
New records are inserted at the tail of the queue and removed from the head.
For new records which would exceed the
high water mark, the calling thread is inserted into the wait queue, waiting
for the audit queue to have enough space available as defined with the field
.Fa aq_lowater .
The field
.Fa aq_bufsz
defines the maximum length of the audit record that can be supplied with
.Xr audit 2 .
The field
.Fa aq_delay
is unused.
The field
.Fa aq_minfree
specifies the minimum amount of free blocks on the disk device used to store
audit records.
If the value of free blocks falls below the configured
minimum amount, the kernel informs the audit daemon about low disk space.
The value is to be specified in percent of free file system blocks.
A value of 0 results in a disabling of the check.
The default and maximum values (default/maximum) for the
audit queue control parameters are:
.Pp
.Bl -column aq_hiwater -offset indent -compact
.It aq_hiwater Ta 100/10000 (audit records)
.It aq_lowater Ta 10/aq_hiwater (audit records)
.It aq_bufsz Ta 32767/1048576 (bytes)
.It aq_delay Ta (Not currently used.)
.El
.It Dv A_SETSTAT
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_SETUMASK
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_SETSMASK
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_SETCOND
Set the current auditing condition.
The
.Fa data
argument
must point to a
.Vt int
value containing the new
audit condition, one of
.Dv AUC_AUDITING ,
.Dv AUC_NOAUDIT ,
or
.Dv AUC_DISABLED .
If 
.Dv AUC_NOAUDIT 
is set, then auditing is temporarily suspended. If 
.Dv AUC_AUDITING
is set, auditing is resumed. If 
.Dv AUC_DISABLED 
is set, the auditing system will
shutdown, draining all audit records and closing out the audit trail file. 
.It Dv A_SETCLASS
Set the event class preselection mask for an audit event.
The
.Fa data
argument
must point to a
.Vt au_evclass_map_t
structure containing the audit event and mask.
The field
.Fa ec_number
is the audit event and 
.Fa ec_class
is the audit class mask. See
.Xr audit_event 5
for more information on audit event to class mapping.
.It Dv A_SETPMASK
Set the preselection masks for a process.
The
.Fa data
argument
must point to a
.Vt auditpinfo_t
structure that contains the given process's audit
preselection masks for both success and failure.
The field
.Fa ap_pid
is the process id of the target process.
The field
.Fa ap_mask
must point to a
.Fa au_mask_t
structure which holds the preselection masks as described in the
.Da A_SETKMASK
section above.
.It Dv A_SETFSIZE
Set the maximum size of the audit log file.
The
.Fa data
argument
must point to a
.Vt au_fstat_t
structure with the
.Va af_filesz
field set to the maximum audit log file size.
A value of 0
indicates no limit to the size.
.It Dv A_SETSFLAGS
Set the audit sessions flags for the current session.
The
.Fa data
argument must point to an
.Vt au_asflgs_t
value containing the new audit session flags.
Audit session flags may be updated only according to local
access control policy.
.It Dv A_GETCLASS
Return the event to class mapping for the designated audit event.
The
.Fa data
argument
must point to a
.Vt au_evclass_map_t
structure. See the
.Dv A_SETCLASS 
section above for more information.
.It Dv A_GETKAUDIT
Get the current host information.
The
.Fa data
argument
must point to a
.Vt auditinfo_addr_t
structure.
.It Dv A_GETPINFO
Return the audit settings for a process.
The
.Fa data
argument
must point to a
.Vt auditpinfo_t
structure which will be set to contain
.Fa ap_auid 
(the audit ID), 
.Fa ap_mask
(the preselection mask),
.Fa ap_termid
(the terminal ID), and
.Fa ap_asid 
(the audit session ID)
of the given target process.
The process ID of the target process is passed 
into the kernel using the
.Fa ap_pid
field.
See the section
.Dv A_SETPMASK
above and 
.Xr getaudit 2 
for more information.
.It Dv A_GETPINFO_ADDR
Return the extended audit settings for a process.
The
.Fa data
argument
must point to a
.Vt auditpinfo_addr_t
structure which is similar to the 
.Vt auditpinfo_addr_t
structure described above. 
The exception is the 
.Fa ap_termid
(the terminal ID) field which points to a
.Vt au_tid_addr_t 
structure can hold much a larger terminal address and an address type. 
The process ID of the target process is passed into the kernel using the
.Fa ap_pid
field.
See the section 
.Dv A_SETPMASK
above and 
.Xr getaudit 2
for more information.
.It Dv A_GETSINFO_ADDR
Return the extended audit settings for a session.
The
.Fa data
argument
must point to a
.Vt auditinfo_addr_t
structure.
The audit session ID of the target session is passed 
into the kernel using the
.Fa ai_asid
field.  See 
.Xr getaudit_addr 2
for more information about the
.Vt auditinfo_addr_t
structure.
.It Dv A_GETKMASK
Return the current kernel preselection masks.
The
.Fa data
argument
must point to a
.Vt au_mask_t
structure which will be set to
the current kernel preselection masks for non-attributable events.
.It Dv A_GETPOLICY
Return the current audit policy setting.
The
.Fa data
argument
must point to a
.Vt int
value which will be set to
one of the current audit policy flags.
The audit policy flags are
described in the 
.Dv A_SETPOLICY 
section above.
.It Dv A_GETQCTRL
Return the current kernel audit queue control parameters.
The
.Fa data
argument
must point to a
.Vt au_qctrl_t
structure which will be set to the current
kernel audit queue control parameters.
See the
.Dv A_SETQCTL
section above for more information.
.It Dv A_GETFSIZE
Returns the maximum size of the audit log file.
The
.Fa data
argument
must point to a
.Vt au_fstat_t
structure.
The
.Va af_filesz
field will be set to the maximum audit log file size.
A value of 0 indicates no limit to the size.
The
.Va af_currsz
field
will be set to the current audit log file size.
.It Dv A_GETSFLAGS
Returns the audit session flags for the current session.
The
.Fa data
argument must point to an
.Vt au_asflgs_t
value which will be set with the current session flags.
.It Dv A_GETCWD
.\" [COMMENTED OUT]: Valid description, not yet implemented.
.\" Return the current working directory as stored in the audit subsystem.
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_GETCAR
.\" [COMMENTED OUT]: Valid description, not yet implemented.
.\"Stores and returns the current active root as stored in the audit
.\"subsystem.
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_GETSTAT
.\" [COMMENTED OUT]: Valid description, not yet implemented.
.\"Return the statistics stored in the audit system.
Return
.Er ENOSYS .
(Not implemented.)
.It Dv A_GETCOND
Return the current auditing condition.
The
.Fa data
argument
must point to a
.Vt int
value which will be set to
the current audit condition, one of 
.Dv AUC_AUDITING ,
.Dv AUC_NOAUDIT 
or
.Dv AUC_DISABLED .
See the 
.Dv A_SETCOND
section above for more information.
.It Dv A_SENDTRIGGER
Send a trigger to the audit daemon.
The
.Fa data
argument
must point to a
.Vt int
value set to one of the acceptable
trigger values:
.Dv AUDIT_TRIGGER_LOW_SPACE
(low disk space where the audit log resides),
.Dv AUDIT_TRIGGER_OPEN_NEW
(open a new audit log file),
.Dv AUDIT_TRIGGER_READ_FILE
(read the
.Pa audit_control
file),
.Dv AUDIT_TRIGGER_CLOSE_AND_DIE
(close the current log file and exit),
.Dv AUDIT_TRIGGER_NO_SPACE
(no disk space left for audit log file).
.Dv AUDIT_TRIGGER_ROTATE_USER
(request audit log file rotation).
.Dv AUDIT_TRIGGER_INITIALIZE
(initialize audit subsystem for Mac OS X only).
or
.Dv AUDIT_TRIGGER_EXPIRE_TRAILS
(request audit log file expiration).
.El
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
The
.Fn auditon
function will fail if:
.Bl -tag -width Er
.It Bq Er ENOSYS
Returned by options not yet implemented.
.It Bq Er EFAULT
A failure occurred while data transferred to or from
the kernel failed.
.It Bq Er EINVAL
Illegal argument was passed by a system call.
.It Bq Er EPERM
The process does not have sufficient permission to complete
the operation.
.El
.Pp
The
.Dv A_SENDTRIGGER
command is specific to the
.Fx
and Mac OS X implementations, and is not present in Solaris.
.Sh SEE ALSO
.Xr audit 2 ,
.Xr auditctl 2 ,
.Xr getaudit 2 ,
.Xr getaudit_addr 2 ,
.Xr getauid 2 ,
.Xr setaudit 2 ,
.Xr setaudit_addr 2 ,
.Xr setauid 2 ,
.Xr libbsm 3
.Sh HISTORY
The OpenBSM implementation was created by McAfee Research, the security
division of McAfee Inc., under contract to Apple Computer Inc.\& in 2004.
It was subsequently adopted by the TrustedBSD Project as the foundation for
the OpenBSM distribution.
.Sh AUTHORS
.An -nosplit
This software was created by McAfee Research, the security research division
of McAfee, Inc., under contract to Apple Computer Inc.
Additional authors include
.An Wayne Salamon ,
.An Robert Watson ,
and SPARTA Inc.
.Pp
The Basic Security Module (BSM) interface to audit records and audit event
stream format were defined by Sun Microsystems.
.Pp
This manual page was written by
.An Tom Rhodes Aq trhodes@FreeBSD.org ,
.An Robert Watson Aq rwatson@FreeBSD.org ,
and
.An Wayne Salamon Aq wsalamon@FreeBSD.org .
